Sawmill of the circular saw reciprocating carriage type



March 30, 1954 E. J. DORNATH ETAL 2,673,581 SAWMILL OF THE CIRCULAR SAW RECIPROCATING CARRIAGE TYPE Filed Aug. 4, 1952 3 Sheets-Sheet l Enpo J. Dornarh Lou 8 R. ,Defwi/er JNVENTORS BY @wm WWW 8m March 30, 1954 E. J. DORNATH ETAL SAWMILL OF THE CIRCULAR SAW RECIPROCATING CARRIAGE TYPE 3 Sheets-Sheet 2 Filed Aug. 4, 1952 March 30, 1954 E.J.DORNATH ETAL SAWMILL OF THE CIRCULAR SAW RECIPROCATING CARRIAGE TYPE Filed Aug. 4, 1952 5 Sheets-Sheet 3 Elmo J; Dome/h Louis R- Defwi/er JNVENTORS Patented Mar. 30, 1954 SAWMILL or C RCULAR CATIN G CARRIAGE SAW itEiPRh- TYPE Eiuio J. Dornath-,.Coqiiille, and Leiiis'RL Detwilx; Maupin, Oi-eg.

Application Aiiriist 4, 1952; serial n6. 302,576

Claims.

This invention relates to new and seful iniprove'ments in sawmills and the primaryobjec't of t 'e present invention is to provide a saw mill including a sliding carriage through a sawing unit.

Another important object of the present invention is to prbvide a saw inill including a saw unit composed of relatively adjustable pairs of parallel blades so that various thickness of side cuts may be made in a 109" as a carriage, supporting the log, mbv'ed past the sawing unit.

A further object of the present invention is to provide a saw mill that Will efie'ctively trim the bark from a log while cutting the log into square and which inVOlvs a means for retaining the Side cuts relative to the leg until the log is released from the holding means of the carriage.

A still further object of the present invention is to provide a saw inill 'Of the aforementioned character as extremely siinple andnr'actical in construction, strong and reliable in use, ffiien't and durable in operation, inexpensive to manu} facture, service and maintain, and otherwise welladapted for the purposes for Which the same is intended.

Other objects and advantages reside in the (retails of construction and eperatien as new fully hereinafter described and claimed, 'i'e'fe'rehces being had to the accompanying drawings ronsing part hereof, wherein like numerals refer t6 like parts throughout, and in which:

Figure 1 is a plan view of the present invention; I

Figure 2 is an enlarged fragmentary rent ele vational view of Figure 1;

Figure 3 is a vertical sectional View taken sub stantially on the of Figure 2; I

Figure 4 is a vertial setional view taken substantially on the plane of section line 44 of u l H, v,

Figure 5 (sheet 3) is an enlarged detail Vertical sectional yiewtalgen substantially on the plane of section line 55 of Figure i; t Figure 6 is an enlarged det'a'il vertical sectional view taken substantiallii an the plane of section the BB of Figure 1; and H Figure 7 is an enlarged detail (fertical sectional view taken substantially on the plane of seetion line 'I"I of Figure 5; i V

Referring now to the drawings in detail, where plane of broken section line 3 3 in for the purpose of illustratin there closed a preferredembodiment 6f the pres vention, the numeral I0 re resents a spaediiaiallel horizontal tells that are fetaihed 2 in elevated position by suitable end supports (not shown) and an intermediate support I2.

A carriage I4 is movable back and forth upon the rails I 0 and includes al 'air of inverted U- shapegi frame members I6 that are fixedly connected at their apices by a horizontal I-beain' I8 whose upper flange supports a reversible electric niotor 20 that is connected to a rotary member or worm 22. The member 22 is engaged with a horizontal trolley line 24 so that as the member 22 is rotated, the carriage I4 maymove onits whee s 26 which are enga e upon the rails I0.

Holders 28 and 30 are 'slidably received on the I-beam l8 Each holder is substantially chan= nel shaped in cross-section to receive the lower flange of the lI-be'am and the leg portions of the eiianiieisare bent inwardly to overlie the lower flange of the if am, as shown in Figure 4. Hamel-s28 and so are connected together by a pneumatically operated jack 32 having a cylinder 34 attached to the holder?!) and a piston rod 36 attached to the holder 28.

Valve means 38 supported on the I-beam I8 and operatively connected to a source of fluid pressure and to the ends or cylinder 34 by conduits, constitutes means whereby the piston rod 36 may be selectively extended or retracted for adjusting the holders 28 and 30 relative to each other .in order that the holders may engage logs of various ngth i Each holder 28, 3|) includes a hollow vertical porfon 40 Fig'. 5) that slidably receives a vertic'al anal: having toothed vertical edge 44. A shaft 46 rotatably supported on portion 40 carries a gear 48 that meshes with the edge 44 to permit vertical adjustment of the arm 42. The forward ends of shafts 4 6 support discs 50 (Fig. 2 having gifaduatidns 52 thereon which win indicat the Vertical adlUstIhnt of the arms to accommodate logs of various iameters. I

The iowereiias or t e arms iotatably supn ift that 'cdai alh ofrizoiit'm shafts 54 (Figs. 5 and 7) paranei-nie fails n. The ad acent, inner eii; of shafts fl are fixed to places 56 having oil ai'dly prejecting penetrating elements 58 see'ured thr'ete. The cuter end of ofie Shaft 54 fliiedl'y supports a plate 69 having circumferentially spaced radial slots 62 for sleetively recei iirig '5, use 54 pirates to the eoi'ispnding one 01 the $142, in o d tfi retain the shaft 56 in a selecte ioiateapositio'n.

A awing unit 66 is dislibs'd upon the intermediate support I2 aim includes a when horizontal shaft one end of whichi's operatively connegte'a to a motor 10 (si s), First an scorfid ed p allell snail-gar saw" blades 12 are siidably keyed on shaft 58 for rotation therewith. The carriers 18 and 18 (Fig. 3) for the blades 12 and 14 are fixed to cross bars 80 and 82 (Figs. 1 and 6) having ears 84 and 86 formed at their ends.

A pair of spaced screws 88 and 90 are rotatably supported on the support 12 in parallel relationship with the shaft 68, and the screws are connected by a belt and pulleys 92 for simultaneous rotation. The screws are provided with oppositely threaded end portions that are engaged with complemental threads'in the ears 84 and 86, so that as the shafts rotate clockwise the blades 12 and 14 will be moved toward each other, whereas counter-clockwise rotation of the screws will move the blades 12 and I4 away from each other. Spacers 94 are disposed between the blades of each pair may vary to permit the blades of each pair to be spaced apart a predetermined distance.

A bracket 96 supported on the carriage l4 pivotally supports a pair of vertically swingable gripper arms or tongs 98 (Figs. 2 and 4) whose upper ends are connected by a coil spring I that yieldingly urged the lower ends of the tongs 98 apart. Hydraulic means including a cylinder I02 pivotally attached to one of the tongs and a piston rod I04 slidably carried by the cylinder I02 and pivoted to the other of the tongs, constitutes a means whereby the lower ends of the tongs may be moved toward each other to hold side cuts C made in a log L by the blades against the log.

In practical use of the present invention, the carriage I4 is moved on the rails I0 until it clears the sawing unit 66. The valve means is actuated to spread the holders 28 and. 30 and then arms 42 are adjusted to the diameter of the log to be cut. The log is held raised by any suitable means and the valve means 38 actuated to move the holders 28 and 30 toward each other and cause the elements 58 to penetrate the ends of the log.

Motor 20 is next started to advance the carriage and motor is also started to drive the saw blades l2, M, the latter having been previously adjusted for side out of the log. As the log is fed through the blades, the side cuts C are retained relative to the log by the tongs 98.

After the log has been cut and the carriage passes the saw blades, dog 64 is raised and the log rotated 90 whereupon dog 64 is engaged with another of the notches 62. The motors 20 and 10 are reversed so that the carriage will move back to its original position pulling the log through the blades to provide additional cuts in the log and square the log, after which the valve means 38 is again actuated to release the cut lo and its side cuts.

The switch means for the motors and the valve means for the hydraulic members illustrated are all located at a convenient position so that a single operator may regulate the feeding, cutting and releasing of the logs. Obviously, the penetrating members 58 may be engaged with the log before the arms 42 are vertically adjusted to the diameter of the log.

Spacers of various thicknesses are disposed between the blades 12, 14 so as to takecare of a board the same thickness as the spacers, thereby sawing a usable board the first time through the saws. The board will not be edged to size; however, when the log is turned ninety degrees, the second cut will produce two boards that will be of the right thickness and which boards will be edged to size. This construction will therefore,

of blades and the lengths of the spacers eliminate the necessity of running all four boards through an edger or sizer.

In view of the foregoing description taken in conjunction with the accompanying drawings, it is believed that a clear understanding of the device will be quite apparent to those skilled in this art. A more detailed description is accordingly deemed unnecessary.

It is to be understood, however, that even though there is herein shown and described a preferred embodiment of the invention, the same is susceptible to certain changes fully comprehended by the spirit of the invention as herein described and the scope of the appended claims. Having described the invention, what is claimed as new is:

1. A sawmill comprising a pair of laterally spaced horizontal rails, a horizontal beam, means riding the rails and supporting the beam at its ends above the rails parallel therewith and between the same and forming with said beam a log carriage movable along said rails, means operatively connected to the carriage to move the same, laterally spaced vertical saw blades, means mounting said blades between said rails beneath said beam for rotation and lateral adjustment to out different thicknesses off a log, a pair of vertical log holders suspended at upper ends thereof from said beam in depending position for supporting the log at its ends for side cutting by said saws and horizontally slidable on said beam toward and from each other to engage and release the ends of the log, means connecting the holders and operative to slide the same in unison, and means on at least one of said holders for retaining the side cuts alongside the log until the log is released.

2. The combination of claim 1, said holders comprising, respectively, a hollow depending vertical portion, and a vertical log holding arm extending downwardly out of the portion and vertically adjustable slidably therein to raise and lower the log.

3. The combination of claim 1, the third named means comprising a saw driving shaft, carriers for the saws slidable along said shaft, a pair of screw shafts on opposite sides of the saw driving shaft, crossbars mounted on said screw shafts for screw feed thereby and operatively connected to said carriers, and belt and pulley connections between said screw shafts for operation of either by the other.

4. The combination of claim 1, said last named means comprising tongs.

5. The combination of claim 1, said last named means comprising tongs, and pneumatic means on said tongs for closing the same.

ENNO J. DORNATH. LOUIS R. DETWILER.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 205,924 Thompson et al. July 9, 1878 375,887 McIntyre Jan.- .3, 1888, 678,658 Grant July 16, 1901 707,184 Thomas Aug. 19, 1902 799,836 Dittbenner Sept. 19, 1905 1,093,680 Beck et a1. Apr. 21, 1914 1,456,912 Rush May 29, 1923 2,001,306 Gressner May 14, 1935 2,254,293 Kaehlert Sept. 2, 1941. 2,501,299 Anderson Mar. 21, 1950 

